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Renesas Technology, Tools FAQs
Last Updated: February 20, 2002
Document Number: 02020510_e
Q.
I want to setup interval data sampling using the OnTimer function the CB79. Please tell me the LSB for the interval to be set in
_win_timer_set. The manual indicates milliseconds (ms). However, based on my tests so far, when I set 1000ms or more, I have no
problem, but when I set 10ms as the interval, the actual interval is around 50ms.
A.
In Windows 98/95, the shortest interval available when generating timer events is around 55ms. Therefore, if you are using
Windows 98/95, even if you set the interval in _win_timer_set to 10ms, the timer events will be generated every 55ms or so.
We think, in Windows 2000, the interval depends on the PC environment (motherboard, etc.).
In addition, when a timer event is generated, the timer message goes to the message queue in the application. The application doesn't
necessarily receive the timer message at the specified interval, and Windows operations may cause a delay. When setting data
sampling, etc., please keep in mind that the timer event intervals are not accurate.
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